Cam actuated reciprocating blade constant area rotary pump



H. A. LEATH Jan. 14, 1958 CAM ACTUATED RECIPROCATING BLADE CONSTANT AREA ROTARY PUMP Filed Spt. 20, 1955 5 Sheets-Sheet 1 V I N VEN TOR.

' ATTD RN EYE Jan. 14, 1958 H. A. LEATH 2,819,677

CAM ACTUATED RECIPROCATING BLADE CONSTANT AREA ROTARY PUMP Filed Sept. 20, 1955 3 Sheets-Sheet 3 INVENTOR.

ATTD RNEYB Jan. 14, 1958 H. A. LEATH 2,8 6

CAM ACTUATED RECIPROCATING BLADE CONSTANT AREA ROTARY PUMP Filed Sept. 20, 1955 3 Sheets-Sheet 2 it m INVENTOR.

ATTORNEYS CAM ACTUATED RECIPROCATING BLADE CGNSTANT AREA ROTARY PUMP Harry A. lLeath, Hazel Park, Mich. Application September 20, 1955, Serial No. 535,475

1 Claim. (Cl. 103-436) This invention relates to prime movers particularly of the rotary pump type and wherein blades are radially slidable in openings in a rotor concentric with a cylinder, and in particular, a pump in which fluid under pressure actuates against a constant area with blades slidably mounted in a rotor concentric with a cylinder of a surrounding casing and in which the supply and outlet openings of the device are adapted to be reversed to reverse the direction of rotation of the rotor.

The purpose of this invention is to provide a pump having a constant pressure area in which a rotor mounted on a driving shaft is concentric with a cylinder and in which openings in which the blades are slidably mounted are adapted to be bored from the periphery of the rotor.

Various types of rotary pumps and engines have been provided and in some pumps of this type blades are radially slidable in slots, however, in substantially all instances the blades are fiat and numerous attempts have been made to provide seals on the sides of the blades. In other devices of this type the blades are urged against cam surfaces of the cylinder by springs in the rotor and the friction resulting from the sliding action of the extended ends of the blades reduces the efficiency of the device. Furthermore, with rotary devices of this type of conventional design, it is difiicult, and substantially impossible, to accurately machine the blades and also the slots in the rotor. It is also diflicult to machine the cylinder in which the blades travel and the surface between the heel or head block of the cylinder and the peripheral surface of the rotor.

With these thoughts in mind, this invention contemplates a housing having a cylindrical opening therein with a rotor mounted on a shaft and positioned in the cylindrical opening with the axis of the rotor and shaft being on the center of the cylinder, with rollers and cam surfaces for actuating the blades and with inlet and outlet connections having control valves therein whereby fluid is adapted to be supplied under pressure to either side of the cylinder.

The object of this invention is, therefore, to provide means for forming a pump of the rotary type wherein the pressure area remains constant as the device operates and wherein. means is provided for reciprocating blades in a rotor to provide inlet, pressure, and exhaust or release areas.

Another object of the invention is to provide a blade mounting for a rotary device in which radially disposed openings for slidably mounting blades are adapted to be bored from the peripheral surface of a rotor.

Another important object of the invention is to provide a rotary device having flat transversely disposed blades on outer ends of cylindrical elements in which rollers rotatably mounted on pins extended from the cylindrical elements are positioned to travel in a cam track of a housing of the device.

A further object of the invention is to provide a rotary device having a rotor concentric with a cylinder in a aye housing in which head blocks are provided in the cylinder and in which the head blocks are adapted to-be' removed to facilitate machining the inner surface of the" cylinder.

A still further object of the invention is to provide a rotary device having cam actuated blades slidably mounted in a rotor concentric with a cylinder in' a surrounding housing in which the device' is of a simple and economical construction.

With these and other objects and advantages in view, the invention embodies a rotary device having a base plate, a cover with a ring positioned between the cover and base plate providing a cylinder, head block-s having inlet openings therethrough removably attached to the ring and cylindrical shanks having blades on extended ends slidably mounted in bores extended into the rotor and adapted to be actuated by rollers on pins extended from sides thereof and positioned in a cam track on the inner surface of the cover, said rotor being adapted to be mounted on a shaft rotatably mounted in the housing formed by the cover, ring and base.

Other features and advantages of the invention will appear from the following description, taken in connection with the drawings, wherein:

Figure l is a side elevational' view of the improved rotary device with parts broken away showing sections through the cylinder and rotor.

Figure 2 is a cross section through the device taken on line 2-2 of Figure 1 illustrating the relative positions of the rotor, housing, blades and inlet and outlet connections.

Figure 3 is a longitudinal section through the device taken substantially on line 3--3 of Figure 2 illustrating the mounting of the rotor and shaft in the housing.

Figure 4 is an exploded view showing the base, rotor, and ring and cover assembly, the parts of the housing being shown in" section.

Figure 5 is an elevational view, with parts broken away, showing the side of the rotor from which the roller carrying pins extend.

Figure 6is an elevational view, showing a portion of the rotor taken on line 66 of Figure 5.

Figure 7 is a view looking upwardly toward the under surface of the cover taken on line 77 of Figure 3 showing the cam groove or track with rollers of the blades positioned in the track, the rollers being shown in positions to correspond with the blades shown in Figure 2.

Figure 8 is a view showing one of the head blocks adapted to be positioned in the cylinder.

Figure 9 is a diagrammatic view illustratingconnections of inlet and outlet openings of the rotary device with the direction of flow of fluid to the openings controlled by a valve and with the supply of fluid maintained under pressure with a pump which draws fluid from a reservoir.

Referring now to the drawings, wherein like reference characters denote corresponding parts, the improved rotary device of this invention includes a circular base 10, a circular cover 11, a ring 12 positioned between the cover and base, a rotor 13 having a continuous peripheral opening 14 providing a cylinder, a shaft 15 on which the rotor is mounted, head blocks 16 and 17, and a cam track 18 formed by an inner plate 19 and an outer plate 20.

The rotor 13 is mounted on a section 21 of the shaft 15 and, as shown in FiguresZ and 3, the rotor is retained in position with a key 22, the outer portion of which extends into a slot 23 in the rotor. The section 21 of the shaft is mounted in a recess 24 of the cover 11 with. a bearing 25 and the bearing is protected with a cover plate 26 that is secured to a boss 27 on the cover 11 with screws 28.

The extended end 29 of the shaft 15 is mounted in an opening 30 in the base 10 with a bearing 31 andthe bearing is secured against a shoulder 32 with a nut 33 nected by a web 54 and with the 3 on a threaded stud 34 extended from the end of the shaft. The base is provided with a recess 35 in which a cover plate 36, which is secured to the base with screws 37, is positioned.

The peripheral edge of the rotor 13 is provided with flanges 38 and 39 between which the annular groove or cylinder 14 is positioned and the body of the rotor is provided with radially disposed bores or cylindrical openings 40 in which cylindrical shanks 41 of blades 42 are positioned. The bores 40 extend inwardly to points 43 and the outer ends of the blades extend into wiping relation with an inner surface 44 of the ring 12.

As illustrated in Figures 1 and 6, the diameters of the shanks 41 of the blades are greater than the width of the cylinder 14 or distance between the flanges 38 and 39 whereby the edges of the blades and peripheral surfaces at the sides of the cylinder 14 extend into arcuate recesses 45 and 46 whereby seals are provided at both ends of the blades.

The cylindrical shanks 41 of the blades are provided with threaded sockets 47 into which pins 48 are threaded, the pins being provided with heads 49 that are positioned in recesses 50 in rollers 51, rotatably mounted on the pins and, as shown in Figure 4, the pins are also provided with spacing washers 52 that retain the rollers in spaced relation to the outer surface of the rotor, the washers or small rollers 52 being extended through radially disposed slots 53 in the side of the rotor.

The rollers 51 are positioned to travel in the cam track or groove 18 which is formed in a plate having an inner section 19 and an outer section 20 with the sections conparts secured in position in the cover 11 by screws 55. With the parts as illustrated in Figure 3, the sections of the cam plate are positioned in a recess 56 in the inner surface of the cover. The cam track 18 is provided with offset sections 57 and 58 and with the parts formed as illustrated in Figure 7 the blades are moved outwardly as they arrive at the position of the upper blades shown in Figure 2 with the rotor traveling in a clockwise direction and are drawn inwardly as they arrive at the position shown by the lower blade in Figure 2. By this means one blade is retained in an inner position as shown at the lefthand side of Figure 2 as it travels across the head blocks 16 and 17 whereas the other two blades are extended.

The head blocks 16 and 17 are duplicates with each provided with an L-shaped inlet opening 59 and a threaded socket 60, the socket 60 of the head block 16 being positioned to register with an opening 61 extended through the ring 12 so that the socket is positioned to receive the threaded inner end of a bolt 62, the head of which is in a counterbore 63 in the peripheral surface of the ring. The extended end of the L-shaped opening 59 is adapted to register with an inlet opening 64 to the outer end of which a tube 65 is connected.

By the same means a tube 66 is threaded in a boss 67 and connected to the outer end of an opening 68 with the inner end of which an L-shaped opening 69 of the head block 17 is in registering relation, and the head block 17 is also provided with a threaded socket 70 into which the inner end of a bolt 71 is threaded,also as shown in Figure 2.

The head blocks 16 and 17 are provided with inner shoulders 72, shown particularly in Figure 8, and surfaces 73 of the head blocks positioned between the shoulders 72 and the ends through which the openings 59 and 69 extend are accurately machined to meet the peripheral surface 74 atthe base of the cylinder 14 of the rotor whereby a seal is provided.

As illustrated in Figure 9, the supply connections 65 and 66 extend to ports 75 and 76 in a housing 77 of a valve 78, and the valve is provided with a core having arcuate slots 79 and 80 in the peripheral surface whereby with the valve in the position shown in Figure 9, pressure 4 is supplied from a pump 81 through a connection 82 to the slot 79 and through the connections 75 and 76 to the opening 59 in the head block 16 whereby pressure is supplied to drive the blade 42 in the upper part of the rotor in a clockwise direction. At the same time an outlet connection 83 extended from an opening 84 through the ring 12 is in communication with one end of the slot whereby an open passage is provided through a connection 84 to a sump or reservoir 85. A suction connection 86 of the pump 81 also extends to the sump or reservoir.

With the parts positioned as illustrated and described, fluid under pressure is supplied through the connection 65 and opening 59 to an area 87 whereby the blades 4-2 are driven in a clockwise direction with fluid in a pocket 88 trapped between two of the blades until one of the blades is drawn inwardly by the otfset section 53 of the cam track and as the lower blade starts inwardly fluid trapped in the pocket 88 is emitted to the connection 83 through the opening 84 so that the fluid passes through the sump or reservoir.

To reverse the direction of rotation of the rotor, at hand lever 89 extended from the valve 78 is moved from the position, shown in full lines in Figure 9 to the position shown in dotted lines whereby fluid under pressure passes from the slot 79 through the connection 76, the tube 66 and the opening 68 to the opening 69 in the head block 17 whereby fluid under pressure is provided in an area 90 and the blades are driven in a counterclockwise direction with the fluid exhausted through an opening 91 anda connection 92 to a port 93 of the housing 77 whereby the fluid passes through the slot 80 and connection 84 to the sump or reservoir 85.

By this means the direction of rotation of the rotor 13 of the device may be reversed as desired and the speed of the device is controlled by the position of the valve member 78 with which the areas of the inlet or supply and return or discharge connections may be varied as desired.

The unit is adapted to be used in a vertical position as illustrated in Figure 1 or in a horizontal position as illustrated in Figure 3 and it will be understood that conventional sealing rings may be positioned on the shanks 41 of the blades 42 and other gaskets or sealing elements may be provided as desired. I

The base 10, cover 11, and ring 12 are disclosed and described as being formed of independent elements with the parts connected with bolts, such as bolts 94, however, it will be understood that the ring may be integral with either the base or cover or the parts may be formed as may be desired.

It will be understood that other modifications, within the scope of the appended claim, may be made in the design and arrangement of the parts without departing from the spirit of the invention.

What is claimedis:

A rotary device comprising a housing having a circular base, a ring positioned on the base, and a circular cover mounted on the ring providing a cylindrical chamber in the ring and between the cover and base, a rotor having spaced continuous flanges extended from the peripheral surface positioned in the cylindrical chamber of the housing and concentric therewith, means for rotatablymounting the rotor in the housing, said rotor having radially disposed bores extended inwardly from the surface between the flanges and said flanges having arcuate recesses aligned with said openings providing sealing means at the sides, cylindrical shanks having flat blades on extended ends slidably mounted in the openings of the rotor, pins having rollers thereon extended from the cylindrical shanks through one side of the rotor,spaced inner and outer plates bolted to the inner surface of the cover providing a cam track in the housing and positioned to receive the rollers of the pins of the cylindrical shanks, head blocks with openings therethrough positioned in opposite sides of the cylindrical chamber and extended into the area between the flanges of the rotor, means for attaching the head blocks to the ring said head blocks and blades being positioned to provide a constant area or constant areas in the cylinder, fluid supply connections extended through the housing and head blocks, and outlet connections extended through the housing, said head blocks being removably mounted in the housing and said cam track being positioned whereby the blades are in retracted positions in passing the head blocks.

115.254 Tenant May 23, 1871 15 Mount July 16, 1829 6 Stott Aug, 11, 1874 Lesperance June 10, 1879 Gleason Dec. 11, 1883 Beck Apr. 15, 1890 Gilbert June 7, 1898 Lehman Nov. 26, 1907 Staff May 11, 1909 Sisson Mar. 19, 1912 Brown Oct. 1, 1912 Deysher Nov. 6, 1917 Davis May 26, 1931 Smith July 9, 1940 MacMillin et a1. Mar. 13, 1951 FOREIGN PATENTS Italy Apr. 30, 1948 France Apr. 19, 1924 Great Britain Nov. 29, 1950 

